cannam@148: // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
cannam@148: // Licensed under the MIT License:
cannam@148: //
cannam@148: // Permission is hereby granted, free of charge, to any person obtaining a copy
cannam@148: // of this software and associated documentation files (the "Software"), to deal
cannam@148: // in the Software without restriction, including without limitation the rights
cannam@148: // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
cannam@148: // copies of the Software, and to permit persons to whom the Software is
cannam@148: // furnished to do so, subject to the following conditions:
cannam@148: //
cannam@148: // The above copyright notice and this permission notice shall be included in
cannam@148: // all copies or substantial portions of the Software.
cannam@148: //
cannam@148: // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
cannam@148: // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
cannam@148: // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
cannam@148: // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
cannam@148: // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
cannam@148: // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
cannam@148: // THE SOFTWARE.
cannam@148: 
cannam@148: #ifndef KJ_STRING_H_
cannam@148: #define KJ_STRING_H_
cannam@148: 
cannam@148: #if defined(__GNUC__) && !KJ_HEADER_WARNINGS
cannam@148: #pragma GCC system_header
cannam@148: #endif
cannam@148: 
cannam@148: #include <initializer_list>
cannam@148: #include "array.h"
cannam@148: #include <string.h>
cannam@148: 
cannam@148: namespace kj {
cannam@148: 
cannam@148: class StringPtr;
cannam@148: class String;
cannam@148: 
cannam@148: class StringTree;   // string-tree.h
cannam@148: 
cannam@148: // Our STL string SFINAE trick does not work with GCC 4.7, but it works with Clang and GCC 4.8, so
cannam@148: // we'll just preprocess it out if not supported.
cannam@148: #if __clang__ || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8) || _MSC_VER
cannam@148: #define KJ_COMPILER_SUPPORTS_STL_STRING_INTEROP 1
cannam@148: #endif
cannam@148: 
cannam@148: // =======================================================================================
cannam@148: // StringPtr -- A NUL-terminated ArrayPtr<const char> containing UTF-8 text.
cannam@148: //
cannam@148: // NUL bytes are allowed to appear before the end of the string.  The only requirement is that
cannam@148: // a NUL byte appear immediately after the last byte of the content.  This terminator byte is not
cannam@148: // counted in the string's size.
cannam@148: 
cannam@148: class StringPtr {
cannam@148: public:
cannam@148:   inline StringPtr(): content("", 1) {}
cannam@148:   inline StringPtr(decltype(nullptr)): content("", 1) {}
cannam@148:   inline StringPtr(const char* value): content(value, strlen(value) + 1) {}
cannam@148:   inline StringPtr(const char* value, size_t size): content(value, size + 1) {
cannam@148:     KJ_IREQUIRE(value[size] == '\0', "StringPtr must be NUL-terminated.");
cannam@148:   }
cannam@148:   inline StringPtr(const char* begin, const char* end): StringPtr(begin, end - begin) {}
cannam@148:   inline StringPtr(const String& value);
cannam@148: 
cannam@148: #if KJ_COMPILER_SUPPORTS_STL_STRING_INTEROP
cannam@148:   template <typename T, typename = decltype(instance<T>().c_str())>
cannam@148:   inline StringPtr(const T& t): StringPtr(t.c_str()) {}
cannam@148:   // Allow implicit conversion from any class that has a c_str() method (namely, std::string).
cannam@148:   // We use a template trick to detect std::string in order to avoid including the header for
cannam@148:   // those who don't want it.
cannam@148: 
cannam@148:   template <typename T, typename = decltype(instance<T>().c_str())>
cannam@148:   inline operator T() const { return cStr(); }
cannam@148:   // Allow implicit conversion to any class that has a c_str() method (namely, std::string).
cannam@148:   // We use a template trick to detect std::string in order to avoid including the header for
cannam@148:   // those who don't want it.
cannam@148: #endif
cannam@148: 
cannam@148:   inline operator ArrayPtr<const char>() const;
cannam@148:   inline ArrayPtr<const char> asArray() const;
cannam@148:   inline ArrayPtr<const byte> asBytes() const { return asArray().asBytes(); }
cannam@148:   // Result does not include NUL terminator.
cannam@148: 
cannam@148:   inline const char* cStr() const { return content.begin(); }
cannam@148:   // Returns NUL-terminated string.
cannam@148: 
cannam@148:   inline size_t size() const { return content.size() - 1; }
cannam@148:   // Result does not include NUL terminator.
cannam@148: 
cannam@148:   inline char operator[](size_t index) const { return content[index]; }
cannam@148: 
cannam@148:   inline const char* begin() const { return content.begin(); }
cannam@148:   inline const char* end() const { return content.end() - 1; }
cannam@148: 
cannam@148:   inline bool operator==(decltype(nullptr)) const { return content.size() <= 1; }
cannam@148:   inline bool operator!=(decltype(nullptr)) const { return content.size() > 1; }
cannam@148: 
cannam@148:   inline bool operator==(const StringPtr& other) const;
cannam@148:   inline bool operator!=(const StringPtr& other) const { return !(*this == other); }
cannam@148:   inline bool operator< (const StringPtr& other) const;
cannam@148:   inline bool operator> (const StringPtr& other) const { return other < *this; }
cannam@148:   inline bool operator<=(const StringPtr& other) const { return !(other < *this); }
cannam@148:   inline bool operator>=(const StringPtr& other) const { return !(*this < other); }
cannam@148: 
cannam@148:   inline StringPtr slice(size_t start) const;
cannam@148:   inline ArrayPtr<const char> slice(size_t start, size_t end) const;
cannam@148:   // A string slice is only NUL-terminated if it is a suffix, so slice() has a one-parameter
cannam@148:   // version that assumes end = size().
cannam@148: 
cannam@148:   inline bool startsWith(const StringPtr& other) const;
cannam@148:   inline bool endsWith(const StringPtr& other) const;
cannam@148: 
cannam@148:   inline Maybe<size_t> findFirst(char c) const;
cannam@148:   inline Maybe<size_t> findLast(char c) const;
cannam@148: 
cannam@148:   template <typename T>
cannam@148:   T parseAs() const;
cannam@148:   // Parse string as template number type.
cannam@148:   // Integer numbers prefixed by "0x" and "0X" are parsed in base 16 (like strtoi with base 0).
cannam@148:   // Integer numbers prefixed by "0" are parsed in base 10 (unlike strtoi with base 0).
cannam@148:   // Overflowed integer numbers throw exception.
cannam@148:   // Overflowed floating numbers return inf.
cannam@148: 
cannam@148: private:
cannam@148:   inline StringPtr(ArrayPtr<const char> content): content(content) {}
cannam@148: 
cannam@148:   ArrayPtr<const char> content;
cannam@148: };
cannam@148: 
cannam@148: inline bool operator==(const char* a, const StringPtr& b) { return b == a; }
cannam@148: inline bool operator!=(const char* a, const StringPtr& b) { return b != a; }
cannam@148: 
cannam@148: template <> char StringPtr::parseAs<char>() const;
cannam@148: template <> signed char StringPtr::parseAs<signed char>() const;
cannam@148: template <> unsigned char StringPtr::parseAs<unsigned char>() const;
cannam@148: template <> short StringPtr::parseAs<short>() const;
cannam@148: template <> unsigned short StringPtr::parseAs<unsigned short>() const;
cannam@148: template <> int StringPtr::parseAs<int>() const;
cannam@148: template <> unsigned StringPtr::parseAs<unsigned>() const;
cannam@148: template <> long StringPtr::parseAs<long>() const;
cannam@148: template <> unsigned long StringPtr::parseAs<unsigned long>() const;
cannam@148: template <> long long StringPtr::parseAs<long long>() const;
cannam@148: template <> unsigned long long StringPtr::parseAs<unsigned long long>() const;
cannam@148: template <> float StringPtr::parseAs<float>() const;
cannam@148: template <> double StringPtr::parseAs<double>() const;
cannam@148: 
cannam@148: // =======================================================================================
cannam@148: // String -- A NUL-terminated Array<char> containing UTF-8 text.
cannam@148: //
cannam@148: // NUL bytes are allowed to appear before the end of the string.  The only requirement is that
cannam@148: // a NUL byte appear immediately after the last byte of the content.  This terminator byte is not
cannam@148: // counted in the string's size.
cannam@148: //
cannam@148: // To allocate a String, you must call kj::heapString().  We do not implement implicit copying to
cannam@148: // the heap because this hides potential inefficiency from the developer.
cannam@148: 
cannam@148: class String {
cannam@148: public:
cannam@148:   String() = default;
cannam@148:   inline String(decltype(nullptr)): content(nullptr) {}
cannam@148:   inline String(char* value, size_t size, const ArrayDisposer& disposer);
cannam@148:   // Does not copy.  `size` does not include NUL terminator, but `value` must be NUL-terminated.
cannam@148:   inline explicit String(Array<char> buffer);
cannam@148:   // Does not copy.  Requires `buffer` ends with `\0`.
cannam@148: 
cannam@148:   inline operator ArrayPtr<char>();
cannam@148:   inline operator ArrayPtr<const char>() const;
cannam@148:   inline ArrayPtr<char> asArray();
cannam@148:   inline ArrayPtr<const char> asArray() const;
cannam@148:   inline ArrayPtr<byte> asBytes() { return asArray().asBytes(); }
cannam@148:   inline ArrayPtr<const byte> asBytes() const { return asArray().asBytes(); }
cannam@148:   // Result does not include NUL terminator.
cannam@148: 
cannam@148:   inline Array<char> releaseArray() { return kj::mv(content); }
cannam@148:   // Disowns the backing array (which includes the NUL terminator) and returns it. The String value
cannam@148:   // is clobbered (as if moved away).
cannam@148: 
cannam@148:   inline const char* cStr() const;
cannam@148: 
cannam@148:   inline size_t size() const;
cannam@148:   // Result does not include NUL terminator.
cannam@148: 
cannam@148:   inline char operator[](size_t index) const;
cannam@148:   inline char& operator[](size_t index);
cannam@148: 
cannam@148:   inline char* begin();
cannam@148:   inline char* end();
cannam@148:   inline const char* begin() const;
cannam@148:   inline const char* end() const;
cannam@148: 
cannam@148:   inline bool operator==(decltype(nullptr)) const { return content.size() <= 1; }
cannam@148:   inline bool operator!=(decltype(nullptr)) const { return content.size() > 1; }
cannam@148: 
cannam@148:   inline bool operator==(const StringPtr& other) const { return StringPtr(*this) == other; }
cannam@148:   inline bool operator!=(const StringPtr& other) const { return StringPtr(*this) != other; }
cannam@148:   inline bool operator< (const StringPtr& other) const { return StringPtr(*this) <  other; }
cannam@148:   inline bool operator> (const StringPtr& other) const { return StringPtr(*this) >  other; }
cannam@148:   inline bool operator<=(const StringPtr& other) const { return StringPtr(*this) <= other; }
cannam@148:   inline bool operator>=(const StringPtr& other) const { return StringPtr(*this) >= other; }
cannam@148: 
cannam@148:   inline bool startsWith(const StringPtr& other) const { return StringPtr(*this).startsWith(other);}
cannam@148:   inline bool endsWith(const StringPtr& other) const { return StringPtr(*this).endsWith(other); }
cannam@148: 
cannam@148:   inline StringPtr slice(size_t start) const { return StringPtr(*this).slice(start); }
cannam@148:   inline ArrayPtr<const char> slice(size_t start, size_t end) const {
cannam@148:     return StringPtr(*this).slice(start, end);
cannam@148:   }
cannam@148: 
cannam@148:   inline Maybe<size_t> findFirst(char c) const { return StringPtr(*this).findFirst(c); }
cannam@148:   inline Maybe<size_t> findLast(char c) const { return StringPtr(*this).findLast(c); }
cannam@148: 
cannam@148:   template <typename T>
cannam@148:   T parseAs() const { return StringPtr(*this).parseAs<T>(); }
cannam@148:   // Parse as number
cannam@148: 
cannam@148: private:
cannam@148:   Array<char> content;
cannam@148: };
cannam@148: 
cannam@148: inline bool operator==(const char* a, const String& b) { return b == a; }
cannam@148: inline bool operator!=(const char* a, const String& b) { return b != a; }
cannam@148: 
cannam@148: String heapString(size_t size);
cannam@148: // Allocate a String of the given size on the heap, not including NUL terminator.  The NUL
cannam@148: // terminator will be initialized automatically but the rest of the content is not initialized.
cannam@148: 
cannam@148: String heapString(const char* value);
cannam@148: String heapString(const char* value, size_t size);
cannam@148: String heapString(StringPtr value);
cannam@148: String heapString(const String& value);
cannam@148: String heapString(ArrayPtr<const char> value);
cannam@148: // Allocates a copy of the given value on the heap.
cannam@148: 
cannam@148: // =======================================================================================
cannam@148: // Magic str() function which transforms parameters to text and concatenates them into one big
cannam@148: // String.
cannam@148: 
cannam@148: namespace _ {  // private
cannam@148: 
cannam@148: inline size_t sum(std::initializer_list<size_t> nums) {
cannam@148:   size_t result = 0;
cannam@148:   for (auto num: nums) {
cannam@148:     result += num;
cannam@148:   }
cannam@148:   return result;
cannam@148: }
cannam@148: 
cannam@148: inline char* fill(char* ptr) { return ptr; }
cannam@148: 
cannam@148: template <typename... Rest>
cannam@148: char* fill(char* __restrict__ target, const StringTree& first, Rest&&... rest);
cannam@148: // Make str() work with stringifiers that return StringTree by patching fill().
cannam@148: //
cannam@148: // Defined in string-tree.h.
cannam@148: 
cannam@148: template <typename First, typename... Rest>
cannam@148: char* fill(char* __restrict__ target, const First& first, Rest&&... rest) {
cannam@148:   auto i = first.begin();
cannam@148:   auto end = first.end();
cannam@148:   while (i != end) {
cannam@148:     *target++ = *i++;
cannam@148:   }
cannam@148:   return fill(target, kj::fwd<Rest>(rest)...);
cannam@148: }
cannam@148: 
cannam@148: template <typename... Params>
cannam@148: String concat(Params&&... params) {
cannam@148:   // Concatenate a bunch of containers into a single Array.  The containers can be anything that
cannam@148:   // is iterable and whose elements can be converted to `char`.
cannam@148: 
cannam@148:   String result = heapString(sum({params.size()...}));
cannam@148:   fill(result.begin(), kj::fwd<Params>(params)...);
cannam@148:   return result;
cannam@148: }
cannam@148: 
cannam@148: inline String concat(String&& arr) {
cannam@148:   return kj::mv(arr);
cannam@148: }
cannam@148: 
cannam@148: struct Stringifier {
cannam@148:   // This is a dummy type with only one instance: STR (below).  To make an arbitrary type
cannam@148:   // stringifiable, define `operator*(Stringifier, T)` to return an iterable container of `char`.
cannam@148:   // The container type must have a `size()` method.  Be sure to declare the operator in the same
cannam@148:   // namespace as `T` **or** in the global scope.
cannam@148:   //
cannam@148:   // A more usual way to accomplish what we're doing here would be to require that you define
cannam@148:   // a function like `toString(T)` and then rely on argument-dependent lookup.  However, this has
cannam@148:   // the problem that it pollutes other people's namespaces and even the global namespace.  For
cannam@148:   // example, some other project may already have functions called `toString` which do something
cannam@148:   // different.  Declaring `operator*` with `Stringifier` as the left operand cannot conflict with
cannam@148:   // anything.
cannam@148: 
cannam@148:   inline ArrayPtr<const char> operator*(ArrayPtr<const char> s) const { return s; }
cannam@148:   inline ArrayPtr<const char> operator*(ArrayPtr<char> s) const { return s; }
cannam@148:   inline ArrayPtr<const char> operator*(const Array<const char>& s) const { return s; }
cannam@148:   inline ArrayPtr<const char> operator*(const Array<char>& s) const { return s; }
cannam@148:   template<size_t n>
cannam@148:   inline ArrayPtr<const char> operator*(const CappedArray<char, n>& s) const { return s; }
cannam@148:   template<size_t n>
cannam@148:   inline ArrayPtr<const char> operator*(const FixedArray<char, n>& s) const { return s; }
cannam@148:   inline ArrayPtr<const char> operator*(const char* s) const { return arrayPtr(s, strlen(s)); }
cannam@148:   inline ArrayPtr<const char> operator*(const String& s) const { return s.asArray(); }
cannam@148:   inline ArrayPtr<const char> operator*(const StringPtr& s) const { return s.asArray(); }
cannam@148: 
cannam@148:   inline Range<char> operator*(const Range<char>& r) const { return r; }
cannam@148:   inline Repeat<char> operator*(const Repeat<char>& r) const { return r; }
cannam@148: 
cannam@148:   inline FixedArray<char, 1> operator*(char c) const {
cannam@148:     FixedArray<char, 1> result;
cannam@148:     result[0] = c;
cannam@148:     return result;
cannam@148:   }
cannam@148: 
cannam@148:   StringPtr operator*(decltype(nullptr)) const;
cannam@148:   StringPtr operator*(bool b) const;
cannam@148: 
cannam@148:   CappedArray<char, 5> operator*(signed char i) const;
cannam@148:   CappedArray<char, 5> operator*(unsigned char i) const;
cannam@148:   CappedArray<char, sizeof(short) * 3 + 2> operator*(short i) const;
cannam@148:   CappedArray<char, sizeof(unsigned short) * 3 + 2> operator*(unsigned short i) const;
cannam@148:   CappedArray<char, sizeof(int) * 3 + 2> operator*(int i) const;
cannam@148:   CappedArray<char, sizeof(unsigned int) * 3 + 2> operator*(unsigned int i) const;
cannam@148:   CappedArray<char, sizeof(long) * 3 + 2> operator*(long i) const;
cannam@148:   CappedArray<char, sizeof(unsigned long) * 3 + 2> operator*(unsigned long i) const;
cannam@148:   CappedArray<char, sizeof(long long) * 3 + 2> operator*(long long i) const;
cannam@148:   CappedArray<char, sizeof(unsigned long long) * 3 + 2> operator*(unsigned long long i) const;
cannam@148:   CappedArray<char, 24> operator*(float f) const;
cannam@148:   CappedArray<char, 32> operator*(double f) const;
cannam@148:   CappedArray<char, sizeof(const void*) * 3 + 2> operator*(const void* s) const;
cannam@148: 
cannam@148:   template <typename T>
cannam@148:   String operator*(ArrayPtr<T> arr) const;
cannam@148:   template <typename T>
cannam@148:   String operator*(const Array<T>& arr) const;
cannam@148: 
cannam@148: #if KJ_COMPILER_SUPPORTS_STL_STRING_INTEROP  // supports expression SFINAE?
cannam@148:   template <typename T, typename Result = decltype(instance<T>().toString())>
cannam@148:   inline Result operator*(T&& value) const { return kj::fwd<T>(value).toString(); }
cannam@148: #endif
cannam@148: };
cannam@148: static KJ_CONSTEXPR(const) Stringifier STR = Stringifier();
cannam@148: 
cannam@148: }  // namespace _ (private)
cannam@148: 
cannam@148: template <typename T>
cannam@148: auto toCharSequence(T&& value) -> decltype(_::STR * kj::fwd<T>(value)) {
cannam@148:   // Returns an iterable of chars that represent a textual representation of the value, suitable
cannam@148:   // for debugging.
cannam@148:   //
cannam@148:   // Most users should use str() instead, but toCharSequence() may occasionally be useful to avoid
cannam@148:   // heap allocation overhead that str() implies.
cannam@148:   //
cannam@148:   // To specialize this function for your type, see KJ_STRINGIFY.
cannam@148: 
cannam@148:   return _::STR * kj::fwd<T>(value);
cannam@148: }
cannam@148: 
cannam@148: CappedArray<char, sizeof(unsigned char) * 2 + 1> hex(unsigned char i);
cannam@148: CappedArray<char, sizeof(unsigned short) * 2 + 1> hex(unsigned short i);
cannam@148: CappedArray<char, sizeof(unsigned int) * 2 + 1> hex(unsigned int i);
cannam@148: CappedArray<char, sizeof(unsigned long) * 2 + 1> hex(unsigned long i);
cannam@148: CappedArray<char, sizeof(unsigned long long) * 2 + 1> hex(unsigned long long i);
cannam@148: 
cannam@148: template <typename... Params>
cannam@148: String str(Params&&... params) {
cannam@148:   // Magic function which builds a string from a bunch of arbitrary values.  Example:
cannam@148:   //     str(1, " / ", 2, " = ", 0.5)
cannam@148:   // returns:
cannam@148:   //     "1 / 2 = 0.5"
cannam@148:   // To teach `str` how to stringify a type, see `Stringifier`.
cannam@148: 
cannam@148:   return _::concat(toCharSequence(kj::fwd<Params>(params))...);
cannam@148: }
cannam@148: 
cannam@148: inline String str(String&& s) { return mv(s); }
cannam@148: // Overload to prevent redundant allocation.
cannam@148: 
cannam@148: template <typename T>
cannam@148: String strArray(T&& arr, const char* delim) {
cannam@148:   size_t delimLen = strlen(delim);
cannam@148:   KJ_STACK_ARRAY(decltype(_::STR * arr[0]), pieces, kj::size(arr), 8, 32);
cannam@148:   size_t size = 0;
cannam@148:   for (size_t i = 0; i < kj::size(arr); i++) {
cannam@148:     if (i > 0) size += delimLen;
cannam@148:     pieces[i] = _::STR * arr[i];
cannam@148:     size += pieces[i].size();
cannam@148:   }
cannam@148: 
cannam@148:   String result = heapString(size);
cannam@148:   char* pos = result.begin();
cannam@148:   for (size_t i = 0; i < kj::size(arr); i++) {
cannam@148:     if (i > 0) {
cannam@148:       memcpy(pos, delim, delimLen);
cannam@148:       pos += delimLen;
cannam@148:     }
cannam@148:     pos = _::fill(pos, pieces[i]);
cannam@148:   }
cannam@148:   return result;
cannam@148: }
cannam@148: 
cannam@148: namespace _ {  // private
cannam@148: 
cannam@148: template <typename T>
cannam@148: inline String Stringifier::operator*(ArrayPtr<T> arr) const {
cannam@148:   return strArray(arr, ", ");
cannam@148: }
cannam@148: 
cannam@148: template <typename T>
cannam@148: inline String Stringifier::operator*(const Array<T>& arr) const {
cannam@148:   return strArray(arr, ", ");
cannam@148: }
cannam@148: 
cannam@148: }  // namespace _ (private)
cannam@148: 
cannam@148: #define KJ_STRINGIFY(...) operator*(::kj::_::Stringifier, __VA_ARGS__)
cannam@148: // Defines a stringifier for a custom type.  Example:
cannam@148: //
cannam@148: //    class Foo {...};
cannam@148: //    inline StringPtr KJ_STRINGIFY(const Foo& foo) { return foo.name(); }
cannam@148: //
cannam@148: // This allows Foo to be passed to str().
cannam@148: //
cannam@148: // The function should be declared either in the same namespace as the target type or in the global
cannam@148: // namespace.  It can return any type which is an iterable container of chars.
cannam@148: 
cannam@148: // =======================================================================================
cannam@148: // Inline implementation details.
cannam@148: 
cannam@148: inline StringPtr::StringPtr(const String& value): content(value.begin(), value.size() + 1) {}
cannam@148: 
cannam@148: inline StringPtr::operator ArrayPtr<const char>() const {
cannam@148:   return content.slice(0, content.size() - 1);
cannam@148: }
cannam@148: 
cannam@148: inline ArrayPtr<const char> StringPtr::asArray() const {
cannam@148:   return content.slice(0, content.size() - 1);
cannam@148: }
cannam@148: 
cannam@148: inline bool StringPtr::operator==(const StringPtr& other) const {
cannam@148:   return content.size() == other.content.size() &&
cannam@148:       memcmp(content.begin(), other.content.begin(), content.size() - 1) == 0;
cannam@148: }
cannam@148: 
cannam@148: inline bool StringPtr::operator<(const StringPtr& other) const {
cannam@148:   bool shorter = content.size() < other.content.size();
cannam@148:   int cmp = memcmp(content.begin(), other.content.begin(),
cannam@148:                    shorter ? content.size() : other.content.size());
cannam@148:   return cmp < 0 || (cmp == 0 && shorter);
cannam@148: }
cannam@148: 
cannam@148: inline StringPtr StringPtr::slice(size_t start) const {
cannam@148:   return StringPtr(content.slice(start, content.size()));
cannam@148: }
cannam@148: inline ArrayPtr<const char> StringPtr::slice(size_t start, size_t end) const {
cannam@148:   return content.slice(start, end);
cannam@148: }
cannam@148: 
cannam@148: inline bool StringPtr::startsWith(const StringPtr& other) const {
cannam@148:   return other.content.size() <= content.size() &&
cannam@148:       memcmp(content.begin(), other.content.begin(), other.size()) == 0;
cannam@148: }
cannam@148: inline bool StringPtr::endsWith(const StringPtr& other) const {
cannam@148:   return other.content.size() <= content.size() &&
cannam@148:       memcmp(end() - other.size(), other.content.begin(), other.size()) == 0;
cannam@148: }
cannam@148: 
cannam@148: inline Maybe<size_t> StringPtr::findFirst(char c) const {
cannam@148:   const char* pos = reinterpret_cast<const char*>(memchr(content.begin(), c, size()));
cannam@148:   if (pos == nullptr) {
cannam@148:     return nullptr;
cannam@148:   } else {
cannam@148:     return pos - content.begin();
cannam@148:   }
cannam@148: }
cannam@148: 
cannam@148: inline Maybe<size_t> StringPtr::findLast(char c) const {
cannam@148:   for (size_t i = size(); i > 0; --i) {
cannam@148:     if (content[i-1] == c) {
cannam@148:       return i-1;
cannam@148:     }
cannam@148:   }
cannam@148:   return nullptr;
cannam@148: }
cannam@148: 
cannam@148: inline String::operator ArrayPtr<char>() {
cannam@148:   return content == nullptr ? ArrayPtr<char>(nullptr) : content.slice(0, content.size() - 1);
cannam@148: }
cannam@148: inline String::operator ArrayPtr<const char>() const {
cannam@148:   return content == nullptr ? ArrayPtr<const char>(nullptr) : content.slice(0, content.size() - 1);
cannam@148: }
cannam@148: 
cannam@148: inline ArrayPtr<char> String::asArray() {
cannam@148:   return content == nullptr ? ArrayPtr<char>(nullptr) : content.slice(0, content.size() - 1);
cannam@148: }
cannam@148: inline ArrayPtr<const char> String::asArray() const {
cannam@148:   return content == nullptr ? ArrayPtr<const char>(nullptr) : content.slice(0, content.size() - 1);
cannam@148: }
cannam@148: 
cannam@148: inline const char* String::cStr() const { return content == nullptr ? "" : content.begin(); }
cannam@148: 
cannam@148: inline size_t String::size() const { return content == nullptr ? 0 : content.size() - 1; }
cannam@148: 
cannam@148: inline char String::operator[](size_t index) const { return content[index]; }
cannam@148: inline char& String::operator[](size_t index) { return content[index]; }
cannam@148: 
cannam@148: inline char* String::begin() { return content == nullptr ? nullptr : content.begin(); }
cannam@148: inline char* String::end() { return content == nullptr ? nullptr : content.end() - 1; }
cannam@148: inline const char* String::begin() const { return content == nullptr ? nullptr : content.begin(); }
cannam@148: inline const char* String::end() const { return content == nullptr ? nullptr : content.end() - 1; }
cannam@148: 
cannam@148: inline String::String(char* value, size_t size, const ArrayDisposer& disposer)
cannam@148:     : content(value, size + 1, disposer) {
cannam@148:   KJ_IREQUIRE(value[size] == '\0', "String must be NUL-terminated.");
cannam@148: }
cannam@148: 
cannam@148: inline String::String(Array<char> buffer): content(kj::mv(buffer)) {
cannam@148:   KJ_IREQUIRE(content.size() > 0 && content.back() == '\0', "String must be NUL-terminated.");
cannam@148: }
cannam@148: 
cannam@148: inline String heapString(const char* value) {
cannam@148:   return heapString(value, strlen(value));
cannam@148: }
cannam@148: inline String heapString(StringPtr value) {
cannam@148:   return heapString(value.begin(), value.size());
cannam@148: }
cannam@148: inline String heapString(const String& value) {
cannam@148:   return heapString(value.begin(), value.size());
cannam@148: }
cannam@148: inline String heapString(ArrayPtr<const char> value) {
cannam@148:   return heapString(value.begin(), value.size());
cannam@148: }
cannam@148: 
cannam@148: }  // namespace kj
cannam@148: 
cannam@148: #endif  // KJ_STRING_H_